Some insects have a life ______ of no more than a few hours.

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问题 Some insects have a life ______ of no more than a few hours.

选项 A、potential
B、span
C、scale
D、scope

答案B

解析 名词词义辨析题。life span意为“寿命”,故答案为B。potential“潜力”;scale“尺度,级别,规模”;scope“(活动或观察的)范围,能力”。
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